/*
 * Copyright 2011 The Rusted Roof, LLC.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package org.proteusframework.platformservice.persistence.messagebean;

import org.proteusframework.core.util.Assert;
import org.proteusframework.platformservice.persistence.api.IResultSet;

import java.util.Iterator;
import java.util.List;

public class ResultSetWrapper<T> implements IResultSet<T>
{
    private List<T> results;

    public ResultSetWrapper(List<T> results)
    {
        Assert.parameterNotNull(results, "Parameter 'results' must not be null");
        this.results = results;
    }

    @Override
    public int count()
    {
        return results.size();
    }

    @Override
    public List<T> list()
    {
        return results;
    }

    @Override
    public Iterator<T> iterator()
    {
        return results.iterator();
    }

    @Override
    public T getUniqueResult()
    {
        return (results.size() > 0)
                ? results.get(0)
                : null;
    }
}
